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The Montblanc 1858 product line is inspired by the legendary professional Minerva watches from the 1920s and 1930s, which were conceived for military use and exploration. Reinterpreting these historical timepieces, the Montblanc 1858 product line expresses the spirit of mountain exploration, embodying the modern trend of returning to nature. The Montblanc 1858 Geosphere UltraBlack is dedicated to the world’s Seven Summit mountaineering challenge, the holy grail of mountaineering adventures. It comes in a 42 mm distressed stainless steel case combined with black and contrasting white design details. The timepiece features a manufacture world-time complication developed by the Montblanc watchmakers in Villeret: two domed globes, turning in opposite directions, that complete a full rotation in 24 hours. Both are surrounded by a scale with the 24 time zones, along with a day and night indication in contrasting colors. This provides an instinctive way of appreciating the different time zones, aided by luminescent continents for increased visibility and performance at night. The timepiece is completed with a black calf leather strap with beige stitching.
Ident No. MB128257
Movement TypeAutomatic, self-winding
Movement CaliberMB 29.25
Frequency4 Hz
26 Jewels
Balance springFlat hairspring
ComplicationsWorldtime with turning northern and southern hemisphere globes, 24-hour scale and day/night indication; Dual time indication; Date by disc
Case MaterialDistressed stainless steel
DialBlack dial with white luminescent rhodium-coated Arabic numerals and indexes
BezelBi-directional turning bezel
Crystal ShapeDomed
Crystal DescriptionDomed sapphire crystal with double anti-reflective coating
Crystal TypeSapphire
CrownFluted distressed stainless steel with Montblanc emblem in relief
Distance Between Horns22 mm
Bezel colorBlack
Bezel FinishMicrobille-Poli
Water Resistant10 bar (100 m) bar
Case Back MaterialDistressed stainless steel case
Bracelet ColorBlack
Case Diameter42 mm
